j5 create JUA250 - USB 2.0 HDMI Display Adapter - Manual (Page 41)

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Display Mode
Extended mode (Default)
This feature allows the display device attached to the USB HDMI Display
Adapter to work as an “extended” display of the on-board screen.
You can adjust the position by clicking “number” of the display first and
select “Extend these displays” and click “Apply”